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The Human Ear and Simple Tests of Hearing

The Human Ear and Simple Tests of Hearing. Ear Anatomy Outer Ear Auricle, external auditory canal and the tympanic membrane Middle Ear An air filled space, ossicular chain Inner Ear Cochlea. Pathways of Sound . Air Conduction

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The Human Ear and Simple Tests of Hearing

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  1. The Human Ear and Simple Tests of Hearing • Ear Anatomy • Outer Ear • Auricle, external auditory canal and the tympanic membrane • Middle Ear • An air filled space, ossicular chain • Inner Ear • Cochlea

  2. Pathways of Sound • Air Conduction • Sound travels through the air and courses through the outer, middle and inner ear • Auricle acts as a funnel to collect sound • Sound waves hit TM and sets the bones into motion • The bones tap cochlea, causing the inner ear fluid to move • Fluid motion activate hair cells, sending signals to auditory nerve • Auditory nerve fires, sending signal to brain

  3. How the ear works • Sound traveling through ear

  4. Pathways of Sound • Bone Conduction • Sound travels through bone vibration • Bypass the outer and middle ear to direct sound to the inner ear through skull vibrations • Cochlea vibrates setting fluids into motion • Hair cells activate sending signals to Auditory Nerve • Auditory nerve fires, sending signals to the brain

  5. Types of Hearing Loss • Conductive hearing loss • Abnormal mechanical function • Impaired air conduction with normal bone conduction • Abnormal outer ear or middle ear with normal inner ear • Sensorineural hearing loss • Abnormal sensory or neural function • Impaired air and bone conduction • Abnormal inner ear or auditory nerve with normal outer/middle ear function • Mixed Hearing Loss • Combined conductive and sensorineural hearing loss • Abnormality in outer/middle ear and inner ear

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